| abstract |
The present invention relates to a positive electrode active material for a secondary battery, more specificallyn n n Li a Ni 1-vwxyz Mn v Co w M x M ' y M " z O 2 (M, M', M" are each independently of one another.n n n At least one selected from the group consisting of Al, Mg, Sr, Ca, P, Pb, Y, Zr, wherein 0.90 ≦ a ≦ 1.15, 0.01 ≦ v ≦ 0.40, 0.01 ≦ w ≦ 0.4, 0 <x + y + z ≦ 0.05) andn n n Li a Ni 1 -vwuxy- z Mn v Co w Al u M x M ' y M " z O 2 (wherein M, M', M" is Mg, Sr, Ca, P, Pb, Y, Zr And a lithium nickel composite oxide represented by 0.90 ≦ a ≦ 1.15, 0 <v ≦ 0.4, 0.05 ≦ w ≦ 0.4, 0 <u ≦ 0.1, and 0 <x + y + z ≦ 0.05). It relates to a positive electrode active material for secondary batteries.n n n When the positive electrode active material according to the present invention is applied to a secondary battery of a non-aqueous electrolyte, heat stability of the active material is significantly reduced at high temperature since the thermal stability is high, thereby ensuring safety of the battery.n n n n Non-aqueous electrolyte, positive electrode active material, lithium nickel composite oxide |